# A Mixture IRTree Model for Performance Decline and Nonignorable Missing Data

> Research article (Educational and Psychological Measurement, 2020) · cited 17× · AI/ML

**Wikidata**: [openalex:W3017534939](https://www.wikidata.org/wiki/openalex:W3017534939)  
**Source**: https://4ort.xyz/entity/a-mixture-irtree-model-for-performance-decline-and-nonignorable-missing-data